Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14374b4f4a7799b…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 00:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2fb5cfec06190fd5f65e4cc555f19097 SHA-1: 08a0c20df22df7b6ad05e47ff4c083b3d152bbec SHA-256: f14374b4f4a7799bec3c43223612b20cabd1c13e60e12f1783d89841d6f26aaa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to phishing or malware download sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://korealabels.com/ckfinder/userfiles/files/17257914760.pdf In PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161343ae77e66f---pajuwepegufapupefezoke.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/3780674198.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/litivezanamon.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/69003951866.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/vidinif.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/77151280109.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/d9e2cbe7b83aa995f111adb847fbb062/82815198947.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613807c1dd7ba---korejomewozokiwijut.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/75656642859.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/2f048e0dde0ac6cba37a40c0ae05bd7a/goratirugen.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/kifubarenawufobedesidife.pdfIn PDF document text
    • http://quinta.cl/upload/files/15917798395.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/wijimobewagegotu.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/dibodoris.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/mitidezovujimosugolipevig.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/72528359046.pdfIn PDF document text
    • https://tsolisp.com/files/file/33869374993.pdfIn PDF document text
    • https://andrejc.si/files/file/84314002208.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/tumekotu.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/rilasigigusaposa.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/falinujef.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/48464527710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=a+word+that+starts+with+f+and+ends+with+kPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA67 10564 bytes
SHA-256: cf99c9c3135e061038d7989ad7ee6710e47dff3ac1ed8d25f9959ee1e2fffe57
font_02_sfnt_off0000e287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE287 15528 bytes
SHA-256: 7fc00561c60130a2546306f72785f7a915fbc9555664c6eccfab67b17cd66671

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